Out-of-bounds Read in Teamviewer
CVE-2021-34858
This vulnerability allows remote attackers to execute arbitrary code on affected installations of TeamViewer. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the parsing of TVS files. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated structure. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-13606.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.038 (89.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 90th percentile — 89.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.038 · newest: 0.038 · change: 0.000
Affected products
- Teamviewer — versions 15.16.8.0
Weakness classification (CWE)
References
- community.teamviewer.com/English/discussion/117794/august-updates-security-patc… (Vendor Advisory)
- www.zerodayinitiative.com/advisories/ZDI-21-1001/ (VDB Entry, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-34858?
- CVE-2021-34858 is a high-severity vulnerability in Teamviewer, classified under Out-of-bounds Read. CVSS score: 7.8/10. Published 2022-01-13.
- How severe is CVE-2021-34858?
- High severity. CVSS v3 base score is 7.8 out of 10.